is the county seat of San Joaquin County in the Central Valley of the U.S. state of California. Stockton was founded by Captain Charles Maria Weber in 1849 after he acquired Rancho Campo de los Franceses. The city is named after Robert F. Stockton, and it was the first community in California to have a name not of Spanish or Native American origin. The city is located on the San Joaquin River in the northern San Joaquin Valley and had an estimated population of 311,178 by the California Department of Finance for 2018. Stockton is the 13th largest city in California and the 63rd largest city in the United States. It was named an All-America City in 1999, 2004, 2015 and again in 2017.